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  <head>
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    <title></title>
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        background-color: #ccc;
        box-shadow: 0px 7px 30px 0px red;
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      .bbb{
        text-shadow: 2px 2px 4px red;
      }
      .ccc{
        filter: drop-shadow(0px 2px 20px red);
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  <body>
    <ul>
      <li>
        <h3>边框阴影</h3>
        <div class="aaa"></div>
      </li>
      <li>
        <h3>文字阴影</h3>
        <div class="bbb">文字阴影</div>
      </li>
      <li>
        <h3>不规则阴影</h3>
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